Shamrock Shake Rocks Nation with Wide Availability

For the first time ever the elusive Shamrock Shake, McDonald's green-tinted, mint-flavored St. Patty's day milkshake, will be available in all 18,000 of the fast food chain restaurants in the U.S. The treat, which has a cult-like following, will be in stores until March 25.

What's the big deal? Since its inception in 1970, the icy treat has been available only in select McDonald's restaurants; in fact, last year only half of the fast food chain outposts across the country carried it. This year the 540-calorie (for a small, of course) dessert has undergone a mini-makeover; it now appears in a plastic see-through cup (a decision from 2011, likely to make it easier to gaze upon its emerald hue) and is topped with whipped cream and a cherry.

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Now that it's easily available, do you think the Shamrock Shake will lose some of its cache? Or will it stay just as popular? If you like the thrill of the hunt, check out nine more limited edition foods and how to get them, here.